A wireless power transfer coil system using offset of electric and magnetic coupling for frequency splitting suppression, which includes one transmitting coil, one receiving coil and four loaded annular metal sheets, is provided. A first annular metal sheet and a second annular metal sheets of the four loaded annular metal sheets are loaded between the transmitting coil and a third and a fourth annular metal sheets of the four loaded annular metal sheets are loaded between the receiving coil to expand a variable distance range of a power transmission. The coil system enables the coils to worked in a state of magnetic and electric coupling. During a process of moving from a long distance to a short distance, a coupling coefficient between the coils changes gradually, but a low coupling degree is still maintained so that a phenomenon of frequency splitting is not produced, thereby maintaining a high-efficiency power transmission within the system.

A wireless communication device can include a channel matching network. The channel matching network includes a pair of coupled lines coupled to the input port, and a capacitive element coupled between the pair of coupled lines and an antenna load.

This invention relates to a covered wire coupling type information communication network, an electromagnetic field coupling communication method and an electromagnetic field coupler, which makes it possible to solve the problem with the mechanical contact system and the structure where wires are exposed in a connector. A first covered wire and a second covered wire are placed in close proximity to each other in a coupling unit, and electromagnetic coupling in the coupling unit creates a data connection between the first and second covered wire.

Provided is a human body communication (HBC) apparatus for a near field communication (NFC) signal, the HBC apparatus including: a first communicator configured to receive a first NFC signal from an NFC reader through a body in proximity to the body; and a second communicator configured to transmit a signal to a user device, wherein first data included in the first NFC signal received from the NFC reader through the body by the first communicator is transmitted to the user device by the second communicator.

A system for radio frequency transmission through a window is provided. The system may include a first wireless coupler, a second wireless coupler, and one or more antennas. The first wireless coupler may be attached to a first side of the window and configured to transmit or receive radio frequency signals. The second wireless coupler attached to a second side of the window and aligned with the first wireless coupler. The first wireless coupler may be configured to transmit or receive the radio frequency signals from the first wireless coupler to the second wireless coupler through the window. The one or more antennas may be electrically connected to the second wireless coupler. One or more radios may transmit or receive the radio frequency signals to or from the one or more antennas.

An electric power receiving apparatus of an electric power transmitting system includes an overvoltage suppressing unit connected in parallel to a resonant circuit. The overvoltage suppressing unit is formed by an impedance element. Impedance of the impedance element is set to such a value that a rise in a voltage across at least one pair of electric power receiving electrodes is suppressed as compared to a case in which the impedance element is not connected, in the process in which coupling capacitance Cm between electric power transmitting electrodes and the electric power receiving electrodes changes from a value held while the electric power transmitting electrodes and the electric power receiving electrodes are in a predetermined positional relationship during normal electric power transmission to substantially zero.

The invention relates to a capacitive, planar information carrier with a first, second and third electrically conductive area wherein the first electrically conductive area is overprinted with a first dielectric layer having a first relative permittivity ∈1 and wherein the third electrically conductive area is overprinted with a second dielectric layer having a second relative permittivity ∈2. In another aspect, the invention relates to an information carrier formed from an electrically conductive surface of an object or an electrically conductive object. In other aspects, the invention relates to methods for the manufacture of information carriers, methods for detecting information carriers and to the use of an information carrier.

A system for charging electronic devices, the system comprising: one or more wireless power transmitters 202, each transmitter having one or more power transmitting elements 212; one or more receiver electronic devices 204 including wireless power receivers, each receiver having one or more power receiving elements 216, the transmitters 202 and receivers 204 being configured to transfer electrical power wirelessly between the transmitting 212 and receiving 216 elements; and one or more non-receiver electronic devices configured to receive electrical power from a power supply via a wired connection, wherein the one or more transmitters 202 are configured to receive electrical power from the power supply via the wired connection of the one or more non-receiver electronic devices.

A system, method, and computer program for detecting proximity of a mobile device, including a circuit configured to detect proximity of a mobile device, and when detection occurs, enable a beacon circuit to wake up and advertise a presence. The circuit including a proximity sensor circuit; a wake signal generated by the proximity sensor circuit when the mobile device has been detected; and a beacon circuit, normally in a low power, non-communicating state, and while activated by the wake signal advertises a presence of the beacon circuit for a predetermined amount of time, after which the beacon circuit returns to a low power, non-communicating state.

Devices, methods, systems, and computer-readable media for an auto-tunable wireless charger are described herein. One or more embodiments include a tuner comprising a directional coupler connected between a frequency generator and a tuning cap to receive reflections on a transmit line of the directional coupler, and a controller coupled to the directional coupler and the tuning cap to monitor the reflections on the transmit line and to adjust the tuning cap based on the monitored reflections on the transmit line.